28488178 has 4 divisors (see below), whose sum is σ = 42732270. Its totient is φ = 14244088.

The previous prime is 28488167. The next prime is 28488197. The reversal of 28488178 is 87188482.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 87188482 = 2 ⋅43594241.

It can be written as a sum of positive squares in only one way, i.e., 26491609 + 1996569 = 5147^2 + 1413^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7122043 + ... + 7122046.

Almost surely, 2^28488178 is an apocalyptic number.

28488178 is a deficient number, since it is larger than the sum of its proper divisors (14244092).

28488178 is a wasteful number, since it uses less digits than its factorization.

28488178 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14244091.

The product of its digits is 229376, while the sum is 46.

The square root of 28488178 is about 5337.4317794235. The cubic root of 28488178 is about 305.4134963122.

It can be divided in two parts, 2848 and 8178, that added together give a triangular number (11026 = T₁₄₈).

The spelling of 28488178 in words is "twenty-eight million, four hundred eighty-eight thousand, one hundred seventy-eight".